Speed Change Function - Mitsubishi Electric MELSECQ Series User Manual

11 SUB FUNCTIONS
Setting item
Pr. 5 Speed limit value
Refer to section "4.2 List of parameters" for setting details.

11.3 Speed change function

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[2] Setting the speed limit function
To use the "speed limit function", set the "speed limit value" in the parameters
shown in the following table, and write it to the QD70.
(The "speed limit value" depends on the motor used. Set it according to the motor
used.)
The setting is made valid when the Programmable controller READY signal [Y0]
turns from OFF to ON.
Setting
value
Set the speed limit value (max. speed during control).
The "speed change function" is designed to change the speed within the " Pr. 5 Speed
limit value" range at any point during speed control of speed-position switching control
or during JOG operation.
Set a new speed in " Cd. 7 New speed value" and make a speed change using " Cd. 6
Speed change request".
The acceleration and deceleration times after a speed change are the values set in
" Cd. 8 ACC/DEC time at speed change" and " Cd. 9 DEC/STOP time at speed
change".
The details shown below explain about the "speed change function".
[1] Control details
[2] Precautions during control
[1] Control details
The following is the operation performed during a speed change for JOG
operation.
V
JOG. 1 JOG speed
Deceleration made at
Pr. 6 Bias speed
value set in
at start
JOG start
OFF
Fig. 11.1 Speed change operation
search engine
Setting details
Speed change to V2
Speed change to V3
V1
V3
V2
Cd. 8
JOG. 2 JOG ACC time
ON
MELSEC-Q
Factory-set
initial value
10000 (pulse/s)
Operation performed when speed
change is not made
Acceleration made at
Cd. 8
value set in
t
Deceleration stop made at
value set in Cd. 9
11
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